Build on OS X 10.11 (with XCode 7.x)

What are the plans for getting the build working on `OS X 10.11.x`? My `OS X 10.10.5` install just forced an AppStore update to `XCode 7.1` so I assume many users will be migrating across to the latest build environment fairly quickly..

I have a number of `OS X 10.10.5` machines with `XCode 7.1` installed so am happy to test when a solution is available..
